package com.shs.riggy.controller;

import com.shs.riggy.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * @Author 晚点再动心
 * @Date 2022/9/13
 */
@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {


    @Value("${upload.filePath}")
    private String basePath;

    /**
     * 文件上传上传
     *
     * @param file 文件
     * @return {@link R}<{@link String}>
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){

        log.info("===========上传的文件为:{}================" ,file);

        //获取原始文件名
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));

        String fileName = UUID.randomUUID().toString() + substring;
        File dir = new File(basePath);
        //判断文件路径是否存在

        if (!dir.exists()){
            //文件目录不存在则创建
            dir.mkdirs();
        }
        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }


    /**
     * 文件下载
     *
     * @param name     名字
     * @param response 响应
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response)  {

        try {
            // 通过输入流来读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath +name));

            //  通过输出流将文件写回到浏览器，并在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            // 输入流读取到 内容放到 bytes数组中
            while((len = fileInputStream.read(bytes)) != -1){ // 输入流还没有读取完数据
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            fileInputStream.close();
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
